Dental engine



(No Model.) 3 Sheets*-Sheet 1'.

0. EEHONE. DENTAL ENGINE.

N0. 492,432. Patented Feb. 28, 1893.

I .ziiiorney Wf WESSES (No Model.)

3 Sheets-Sheet 2.

G. E. RHONE. DENTAL ENGINE.

N0. 492,432. Patented Feb. 28, I893.

WJZJVESSES w MI 0 U d (No Model.) 3 Sheets-Sheet a.

G. E. RHONB'. DENTAL ENGINE.

No. 492,432. Patented Feb. 28, 1893.

.ziiiorne Tu: nonms PETERS co, woroumou wxsmusrcx. o. c.

UNITED STATES PATENT OFFICE.

CHARLES EDWARD RHONE, OF BELLEFONTE, PENNSYLVANIA.

DENTAL ENGINE.

SPECIFICATION forming part of Letters Patent No. 492,432, dated February 28, 1893.

Application filed May 11, 1892. Serial No. 432.650. (N model.)

To aZZ whom it may concern.-

Be it known that I, CHARLES EDWARD RHONE, a citizen of the United States of America, residing at Bellefonte, in the county of Centre, in the State of Pennsylvania, have invented a new and useful Improvement in Dental Engines, of which the following is a specification.

This invention relates to dental engines which are usually attached to the wall and operated by a motor.

The object of this invention is to provide an engine arm capable of universal adjustment in any direction, which is free to be adjusted at the will of the operator, and which will maintain itself in its adjusted position without manipulation of a set screw or other locking device on the part of the operator.

The object of the invention is further to provide an automatic tension device for the driving cord whereby said cord is automati cally elongated or contracted and the tension regulated and maintained when the arm is swung in any direction and even when said arm is axially elongated or shortened.

Figure l of the accompanying drawings represents a perspective view of this improved dental engine, and alsoa side elevation of the engine head, flexible shaft and hand piece in detached position. Fig. 2 represents a transverse sec'tion through the extensible arm thereof, and the clamp for holding the tele' scopic sections of said arm in extended positions against the tendencyof the driving cord to contract said arm. Fig. 3 represents a plan View partly insection of the inner end of the engine arm and the swiveled bracket to which it is pivoted, showing the spring clamp for holding said arm in adjusted position on said bracket and permitting it to move freely at the will of the operator. 1 Fig. 4 represents a plan view of the under side of the telescoping sections of the engine arm showing the clamp for holding them in position on each other. Fig. 5 represents a fragment of the swiveled bracket, a transverse section of the engine arm and the spring clamp for holding said'parts together. Flggdrepresents a fragment of the swiveled bracket and a portion of the spring clamp for holding the engine arm in contact with said bracket. Fig.7 represents a horizontal section of one of the selfadjusting slides for regulating the tension of the driving cord, the pulley attached to said slide and the guide rod on which the said slide plays. Fig. 8 represents a fragment of the swiveled bracket to which the engine arm is attached, said bracket being provided with a downwardly and rearwardly extended arm carrying pulleys for the driving cord, whereby said pulleys are; located adjacent to the center of motion of said swiveled bracket. Fig. 9 represents the engine head detached from the engine arm. Fig. 1 0 represents the tension device showing the movable slides in the position which they assume when the driving cord is driving the tool in-forward motion. Fig. 11 represents the tension device showing the movable pulleys in the position which they a'ssumewhen the cord is moving in a direction to drive the drill in a reverse motion. V

The same reference numbers are used in all the figures in the designation of the same parts.

The wall plate 10 is designed to be attached to the wall in any desired position adjacent to the dental chair or it may constitute an upright standard attached to the floor adjacent to said chair. This wall plate is pro vided with ears12 andlS near its upper end. Fixed studs 14 and 15 provided with pulleys 16 and 17 are disposed on said wall plate below said ears. Two-fixed studs 18 and 19 are disposed on said wall plate both in the same vertical plane and provided with eyes at their outer ends, and two fixed studs 20 and 21 are likewise disposed on said wall plate in the same vertical plane with each other and to the right of the studs 18 and 19, said studs 20 and 2lbeing also provided with eyes at their outer ends. A guide rod 22 preferably angular in cross section, is supported in the eyes of the studs 18 and 19 and a similar guide rod 23, also angular in cross section, is supported in the eyes of the studs 20 and 21. A tension Pulleys 37 and 38 are journaled on studs on I said bracket preferably on the dependent arm l 36 thereof, whereby they are adjacent to the center of motion of said bracket.

An engine arm 40 is pivoted to the swiveled bracket 30. This engine arm is preferably constructed in three sections, a rear sec-; tion 41., an outer tubular section .51, attached to the outerend of the section :41, and an in- .ner tubular section 61 which telescopes within the tubular section 51.

The inner 3 section 41 is pivoted at its forked rear end to the vertical rear arm 33of the-bracket 30and said section is .providednearrits forward end with :a recess 43 whichengages thearcshaped arm 34 of said bracket. .A spring clamp;

serves to hold the engine ;arm in any desired position .to which it may be adjusted on said bracket.

Thisspring clamp, as shownin the Y drawings, comprises a semielliptic spring 44 disposed on the arc-shaped arm 34 opposite the recess of the arm 41, .a headed stud '45 i having a screw-threaded tang 46 extending through theslot 35'of the arc-shaped armand 5 through-said spring and being provided on '5 its outer end with .a :n ut 47.

The spring 44 is provided with two guide studs 48 and 49 which extend into :and play g in the slot35 of athearc-shaped arm 34 and serve to retain the spring in position on the arc shaped arm, preventing its swiveling on the stud. This spring is also preferably pro- Nided-vvith an inner facinglof leather orother suitable material to cause greater friction on i the arc-sh aped arm.

This spring clamp has sufficient friction to hold the engine arm at any angle to which it may be swung :on the 1 bracket and yetowing to its elasticity itpermi ts said engine arm to be-moved in either' direct-ion by pressure of the operator u-ponit without the interruption necessary in case a set screw or other locking device requiring special adjustment were used.

Theouter tubular section 5 1 of the engine arm 40 is provided with .a longitudinal slot 52,,and *the inner tubular ISGCIlOIFGl which slides within the section 51 is provided with a-tongue 62 which engagessaid slot. Aspring clamp serves to hold the tubular section'61 in the :position towhich it is adjusted, preventing accidental sliding thereof within the outer tube and permitting said inner tube to slide in theouter tube at the willof the operator to elongate or shorten the engine arm without adjustment of said clamp by the operator. This clamp as shown in the drawings journaled. This tapered end is also provided with a handle 69 whereby the telescoping section may be readily pulled out or pushed within the outer section so as to extend or shorten the-engine arm. V

An adjustable engine head 70 of any ordinary or suitable construction is disposed in the socket .66 and carries ;a shaft .71 having a pulley 72. attached to one end-of theshaft 7 1, and an ordinary hand piece 580 carrying the drill chuck is attached to the outer end of the flexible shaft.

A reversible driving shaft 9001' any suit- :able motor, driven by water, electricity or .otherpower, is located beneath the wall plate and carries a pulley 91.

Adriving belt 100 preferably in theform of :a cord .passes over the pulley 91-of the motor, cover the pulley 17 :of the fixed stud 15 then downward under the pulley 2.7 on the self-adjusting slide 26, thence upward over the pulley 38.0.n oneside-of tthe hinged bracket 30,;thence outward along the enginea-rmand under the pulley 68 on one sidetofithe socket 66:at.theo.uter'end of said ar-m, thence @0316! the pulley 'Z 2 of the" engine head, thence back under ithe pulley -67 attached to the opposite side of said socket, thence inward along the engine arm and over the pulley .37 attached to the opposite side of the saidhingedbracket,

The ordinary flexible shaft 73 is thence downward under the pulley 25 .at-

tached to the other self-adjusting slide 24,

thence upward and over the pulley l6journaled on the fixed stud 14, and thence downward to the motor ipulley 91.

In the useof this improveddental engine the engine arm 40' has a universal adjustment by means of the horizontallyswinging bracket .30and the vertical motionof said arm pivoted to said bracket. The enginearm-can also be elongated or contracted to-any desired extent by the sliding of one of its sections upon .another. The elongation and contraction of the 'enginearm is preferably efiected by telescoping one of its sections within :the other, butit is obvious that any other construction'which will permit one sectionto slide upon the other may be substituted for that shown. The self-adjusting slides '24 and 26 and the guide pulleys which operate in conjunction therewith constitute an automatic tension device for regulating the tension of the driving cord. The capacity of thisau-tomatic tension device is such'that it-will regulate and maintain the tension of the driving cord automatically under any movements of IIO the engine arm whether horizontal-or vertical and even'when said arm is elongated and contracted. This is an important feature, as the attention of the dentist is not distracted from his work to adjust the cord when he elongates or shortens the arm.

When the engine is moving forward the left hand slide 24 carrying the pulley 25 will always remain at the upper end of the guide rod and the right hand slide 26 carrying the pulley 27 will serve as the adjusting pulley to lengthen or shorten the cord when the engine arm is pushed in or pulled out or swung to the right or left. When the engine arm is pushed in to its shortest position the slide 26 will be at or near the lower end of its guide rod as shown in Fig. 10 and as said arm is pulled out or elongated said slide will rise on said guide rod, and when said arm is extended to its extreme length, said right hand slide 26 will also be at the top of its guide rod.

When the engine is reversed, the right hand slide 26 carrying the pulley 27 will assume position at the upper end of its guide rod, and theleft hand slide 24 carrying the pulley 25 will serve as the adjusting device for the driving cord, assuming position at the lower end of its guide rod as shown in Fig. 11 when the arm is at its shortest, at the top of its guide rod when the arm is extended at its full length, and at a point between said extremes when the arm is partially drawn out.

As shown in Fig. 1 the tension slides may be 7 said to be in the act of shifting their positions from a reverse to a forward motion of the engine. 0

I claim as my invention- 1. The combination of a swiveled bracket, an engine arm pivoted to said bracket to swing in a plane at an angle to the plane of movement of said bracket, an automatic spring clamp which holds said engine arm in adjusted position on said bracket and permits it to swing freely thereon at the will of the operator, an engine head supported by said arm, a tool chuck in operative connection with said engine head, and means for operating said engine head.

2. The combination of a swiveled bracket provided with a slot, an arm pivoted to said bracket to swing in a plane at an angle to the plane of movement thereof, a semi-elliptic spring in contact with said bracket and a stud connected with said spring and extending through said slot and through said arm.

3. The combination of a swiveled bracket, an engine arm pivoted to said bracket to swing in a plane at an angle to the plane of movement of said bracket, and an automatic spring clamp which holds said arm in adjusted position on said bracket and permits it to swing freely thereon at the will of the operator, said clamp consisting of a semielliptic spring provided with a frictional contact face, and a clamping stud passing through said members.

4. The combination of a swiveled bracket provided with a slot, an arm pivoted to said bracket to swing in a plane at an angle to the plane of movement thereof, a semi-elliptic spring in contact with said bracket and provided with guide studs engaging said slot, and a clamping stud extending through said spring and arm and through the slot of said bracket.

5. The combination of a swiveled bracket provided with an arc-shaped slotted bar, an arm pivoted to said bracket to swing in a plane at an angle to the plane of movement thereof, and provided with a recess engaging said arc-shaped bar, and a clamping device for holding said arm in adjusted position on the arc-shaped bar.

Y 6. The combination of an adjustable arm,

an engine head supported thereon, a tool chuck in operative connection with said head,

pulleys on said arm,a driving shaftprovided with a pulley,pulleys disposed on fixed studs between said driving pulley and adjustable arm, two movable tension pulleys disposed between said fixed pulleys and said driving shaft, and a driving belt passing over said pulleys.

7. The combination of an extensible arm, and an engine head supported thereon, a tool chuck in operative connection with said head, pulleys on said arm,a driving shaft provided with a pulley, pulleys disposed on fixed studs between said driving pulley and extensible arm, two movable tension pulleys disposed between said fixed pulleys and said driving shaft, and a driving belt passing over said pulleys.

8. The combination of an adjustable arm, an engine head supported thereon, a tool chuck in operative connection with said engine head, a driving shaft provided with a pulley, pulleys on said adjustable arm, pulleys on fixed studs disposed between said arm and said driving pulleys, two vertical guide rods, two slides disposed on said guide rods and provided with pulleys, and a driving belt passing over said pulleys.

9. The combination of a swiveled bracket, an engine arm pivoted to said bracket and provided with a dependent arm, an engine head supported on said engine arm, and means for operating said engine head, said means including pulleys disposed on said dependent arm in line with the axis of said swiveled bracket.

10. The combination of a pivoted arm, an engine head supported thereby, a tool chuck in operativeconnection with said engine head, and means for operating said engine head, said pivoted arm comprising two tele scoping sections and a spring clamp connecting said sections and consisting. of a bow spring and an adjusting screw passing thronghsaid spring'and througha slot in one of said sections and threaded into the other i operative connection with said engine head,

section.

11. The combination of a bracket, an en gine arm, an automatic spring clamp uniting them with a yielding tension, whereby said engine arm is held in adjusted position on said bracket and permitted to swing freely thereon at the will of the operatoran engine head supported bysaid arm, a .tool chuck in 10 and means for operating said engine head. CHARLES EDWARD RHONE. Witnesses:

F. (J. SOMES, C. W. WEED. 

